STV82X6D Ver la hoja de datos (PDF) - STMicroelectronics

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componentes Descripción

Fabricante

STV82X6D

Multistandard TV Audio Processor and Digital Sound Demodulator

STMicroelectronics 

STV82x6

Audio Processor Block

Figure 12: Differential Balance

100%

Right Channel

Left Channel

Mute

80h

00h

7Fh

I²C Control

3.6.2

Independent Mode

This is enabled by setting the BAL_MODE bits in both the LS_VOL_CTRL and HP_VOL_CTRL

registers to Independent mode. In this case, the register values are used to control the volume/

balance functions as described in Table 6.

Table 6: Volume/Balance Control Registers

Mode

LS_CVOL/LS_VOL_L

HP_CVOL/HP_VOL_L

Register 68h/76h

LS_VOL_CTRL (Loudspeaker Volume Control)

BAL_MODE = 0

(Independent Mode)

LS_VOL_L

Left Volume value

BAL_MODE = 1

(Differential Mode)

LS_CVOL

Common Right/Left Volume value

HP_VOL_CTRL (Headphone Volume Control)

BAL_MODE = 0

(Independent Mode)

HP_VOL_L

Left Volume value

BAL_MODE = 1

(Differential Mode)

HP_CVOL

Common Right/Left Volume value

LS_BAL/LS_VOL_R

HP_BAL/HP_VOL_R

Register 69h/77h

LS_VOL_R

Right Volume value

LS_BAL

Differential Balance value

HP_VOL_R

Right Volume value

HP_BAL

Differential Balance value

3.6.3

Mute Control

An Independent Mute Control can be used to smooth audio envelope variations in order to prevent

any audible plops can be applied to all audio outputs. This feature is controlled by register

ANA_LS_HP.

A Headphone Detection Mode that will automatically mute the Loudspeaker and Subwoofer outputs

when a headphone is detected can be enabled by the HDP_ON bit in the ANA_LS_HP register. In

this case, only the Headphone output will remain active. See also Section 3.8: Subwoofer Control

and Section 5.4: Headphone Detection.

When a demodulated source is selected on the audio output, the mute is also controlled by

Automatic Standard Recognition system (AUTOSTD). In case of no mono detected or bad detection

of language without backup, the corresponding audio output is automatically muted. In case of

multi-language, the output will be de-muted by selecting an other language with backup.

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